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A granitoid complex from Badaling area, North China: composition, geochemical characteristics and its implications.

文献类型：期刊论文

作者Wang, Y; Zhang, Q
刊名ACTA PETROLOGICA SINICA
出版日期2001-10-01
卷号17期号:4页码:533-540
关键词granitoid adakite-like rocks geochemistry genesis Badaling area
ISSN号1000-0569
文献子类Article
英文摘要Badaling granitoid complex in Beijing area is a typical example of Yanshanian intrusions. According to the geochemical characteristics and genesis, the complex can be divided into three groups. The first group is composed of gabbrodiorites. The rocks are characteristic of enriched Fe, Ti and P, Th/Ta approximate to1 (0.7 similar to1.2), and low I-Sr ratios (0.705 on the average) and low epsilon (Nd)(t) values (-8 similar to -11), probably formed in the interplate environment. The gabbro-diorites are resulted from partial melting of subcontinental lithospheric mantle, probably representing the underplating basaltic magma below the thickened continental crust during Yanshanian period. The second group is the main body of Badaling complexe, consisting of quartz diorite, granodiorite and adamellite. The chemical compositions show that they have SiO2 > 57%, K2O > 2.7%, Na2O/K2O = 0.9 similar to 1.7, Al2O3 between 16 and 14%, LREE enrichment with (La/Yb)(N) = 24 similar to 41, HREE depletion with Yb<1.32 g/g, no or small negative Eu anomaly (Eu/Eu* = 1.0 similar to0.9), high Sr content (354 similar to 1191 mug/g) and low Y content (<16 g/g) with high Sr/Y ratios (45 similar to 156). Except for relatively high K2O and low Al2O3 content, they are similar to adakite in composition, suggesting that the magma is equilibrated with garnet in the deep and is derived from the bottom of thickened continental crust of North China block during Yanshanian period, probably the products of partial melting of intermediate-basic granulite in the lower crust. The third group is composed of adamellite and quartz monzonite. They belong to A-type granite and are characteristic of Na2O + K2O > 9%, Sr and Ba depletion and Rb and LREE enrichment, with relatively large negative Eu anomaly (Eu/Eu* =0.4-0.5). Due to the formation of adakite-like rocks of the second group, the lithospheric delamination occurs and cause asthenosphere to upwell to the bottom of thinned continental crust. The granotoid rocks of the third group is therefore formed by the partial melting of the materials in the crust-mantle transformation belt. The Yanshanian magmatism in Badaling area is not related to the subduction of palco-Pacific Plate, but to the extension within the continent plate.
WOS关键词MAGMAS ; CRUST
WOS研究方向Geology
语种英语
WOS记录号WOS:000172356500004
出版者SCIENCE PRESS
源URL[http://ir.iggcas.ac.cn/handle/132A11/76967]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Y
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 10029, Peoples R China
2.NW Univ Xian, Dept Geol, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Y,Zhang, Q. A granitoid complex from Badaling area, North China: composition, geochemical characteristics and its implications.[J]. ACTA PETROLOGICA SINICA,2001,17(4):533-540.
APA Wang, Y,&Zhang, Q.(2001).A granitoid complex from Badaling area, North China: composition, geochemical characteristics and its implications..ACTA PETROLOGICA SINICA,17(4),533-540.
MLA Wang, Y,et al."A granitoid complex from Badaling area, North China: composition, geochemical characteristics and its implications.".ACTA PETROLOGICA SINICA 17.4(2001):533-540.

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来源：地质与地球物理研究所

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